Posts Tagged with php converter

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Wiki: PHP Convert Hex Color to RGB and RGB to Hexwiki
posted by admin on April 13, 2016
Converting certain values back and forth is often necessary when developing functions to help your website work the way you want it to. I needed a function that would convert a hex color to rgb and for some reason it took me a while to figure it out.

function hex2rgb($hex) {
$hex = str_replace("#", "", $hex);

if(strlen($hex) == 3) {
$r = hexdec(substr($hex,0,1).substr($hex,0,1));
$g = hexdec(substr($hex,1,1).substr($hex,1,1));
$b = hexdec(substr($hex,2,1).substr($hex,2,1));
} else {
$r = hexdec(substr($hex,0,2));
$g = hexdec(substr($hex,2,2));
$b = hexdec(substr($hex,4,2));
}
$rgb = array($r, $g, $b);
//return implode(",", $rgb); // returns the rgb values separated by commas
return $rgb; // returns an array with the rgb values
}


This function works with both shorthand hex codes such as #f00 and longhand hex codes such as #ff0000. It also accepts the number sign (#) just in case. You can see there are two return lines at the end of the function. The first, which is commented out, will return the rgb values separated by a comma. The second, which is the default, will return an array with the rgb values.

So now with this function in place we can use it like so:

$rgb = hex2rgb("#cc0");
print_r($rgb);


The above function would output:

Array ( [0] => 204 [1] => 204 [2] => 0 )


Since we are going one way with this, might as well go the other. Here is a function to convert rgb to a hex color:

function rgb2hex($rgb) {
$hex = "#";
$hex .= str_pad(dechex($rgb[0]), 2, "0", STR_PAD_LEFT);
$hex .= str_pad(dechex($rgb[1]), 2, "0", STR_PAD_LEFT);
$hex .= str_pad(dechex($rgb[2]), 2, "0", STR_PAD_LEFT);

return $hex; // returns the hex value including the number sign (#)
}


This function works like so:

$rgb = array( 255, 255, 255 );
$hex = rgb2hex($rgb);
echo $hex;


The above function would output:

#ffffff
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Resolved: PHP value to boolean true or false convert
posted by admin on March 6, 2016
I have some value. I want convert it to boolean, if value is not empty or not NULL, return true, else return falseRead more